Picture a chalky, calcified showerhead. The same thing can happen to your own head over time if you don’t nix the hard-water minerals that glom on to lengths. One thing that works? Rinsing with apple cider vinegar, which lowers the pH of the mineral buildup enough to break it apart. But who wants their hair to smell like an egg dye kit? New products offer the benefits with a more sophisticated scent—Christophe Robin Purifying Hair Finish Lotion, for instance, uses a not-at-all-sour-smelling sage vinegar as its acidic agent. Once a week, spritz it onto dry hair from roots to tips and run your fingers through strands to distribute.